This paper presents the effect of centrifugal load in functionally graded (FG) hollow sphere subjected to uniform magnetic field. Analytical solution for stresses and perturbation of the magnetic field vector are determined using the direct method and the power series method. The material stiffness, the magnetic permeability and the density vary continuously across the thickness direction accor...

An infinite elastic medium with a planar crack is considered. The crack is subjected to the pressure of fluid injected at a point on the crack surface. Description of the crack growth is based on the lubrication equation (balance of the injected fluid and the crack volume), the equation for crack opening caused by fluid pressure on the crack surface, the Poiseuille equation related local fluid ...

Due to the extremely small size and arbitrary orientation of cracks, a highly sensitive sensor based on balanced-field electromagnetic technique was designed for in-line inspection oil gas pipeline cracks. A mutual inductance model established used theoretically analyze parameters affecting sensitivity. Finite element simulation specific effects magnetically conductive medium, number coil turns...

axial vibration effect of shell particles on dynamic stability of a cantilevered cylindrical shell under an axial follower force was addressed. in spite of free-ended shells, the reduced axial force under this effect cannot be derived analytically. instead, an approximate method was proposed based on the fact that the static (and harmonic) axial deformation under an axial load in a free-ended b...

With the construction of underground rock engineering, surrounding in deep tunnels appears zonal disintegration fracture and intact zones alternate distribution, which is a special engineering geological phenomenon. This study establishes partitioned model under coupling high in-situ stress osmotic pressure, identify key influencing factors model. Furthermore, intensity factor (SIF) initial cra...

The effects of residual stress on the hydrogen embrittlement behavior a tempered martensitic steel sheet with 1-GPa-class tensile strength stretch-formed by hemisphere punch simulating press-formed automotive structural parts were investigated. Cracking specimen induced potentiostatic charging was initiated in foot impression and propagated to radial direction both toward hillside plain. mixtur...

An assessment of the plasticity-induced crack-closure concept is made, in light of some of the questions that have been raised on the validity of the concept, and the assumptions that have been made concerning crack-tip damage below the crack-opening stress. The impact of using other crack-tip parameters, such as the cyclic crack-tip displacement, to model crack-growth rate behavior was studied...

poor stand establishment of canola (brassica napus l.) under flatland mechanized planting and crust-forming soil is a major problem for farmers in central iran. previous research there showed that irrigated cotton emergence on crust-forming soils under flatland planting can be significantly improved using a double-disk planter with zero-pressure press wheel tires and no crust-breaking. in that ...

Fatigue crack growth can be strongly influenced by crack closure, i. e., the contacting of the opposing faces of a fatigue crack above the minimum load in a loading cycle. This crack closure shields the crack tip from the full stress field, but different views are held regarding the extent of this shielding. The type of closure, whether it be plasticity-induced, or roughness-induced may also pl...